code: def tearDown(self) -> None:
      keras.backend.clear_session()
  
imports: import os
  import tempfile
  import unittest
  from tensorflow import keras
  from tfaip import INPUT_PROCESSOR
  from tfaip.util.tfaipargparse import post_init
  from calamari_ocr.ocr.dataset.datareader.file import FileDataParams
  from calamari_ocr.ocr.dataset.imageprocessors.center_normalizer import CenterNormalizerProcessorParams
  from calamari_ocr.ocr.dataset.imageprocessors.scale_to_height_processor import ScaleToHeightProcessorParams
  from calamari_ocr.ocr.training.pipeline_params import CalamariSplitTrainerPipelineParams, CalamariTrainOnlyPipelineParams
  from calamari_ocr.scripts.train import main
  from calamari_ocr.test.calamari_test_scenario import CalamariTestScenario
  from calamari_ocr.utils import glob_all
label_desc: Use image node_id 1 for calling the TestTrainFile obj's underlying member method code with example usage: obj.tearDown() without return types